.section {
  display: none;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.section.visible {
  display: block;
}

/* Animaciones */
.fade-in {
  animation: slideFadeIn 0.6s ease forwards;
}

.fade-out {
  animation: slideFadeOut 0.4s ease forwards;
}

@keyframes slideFadeIn {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideFadeOut {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-30px);
  }
}